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Some of the nontoxic metals normally found in natural water are

1. arsenic, lead and mercury
2. calcium, sodium and silver
3. cadmium, chromium and copper
4. iron, manganese and magnesium

Correct answer: iron, manganese and magnesium

Solution

Natural water commonly contains harmless dissolved metals such as iron, manganese, and magnesium. The other options include toxic heavy metals or an unlikely combination for natural water quality.

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